let Cesium = require("cesium/Cesium")

class PolylineTrailMaterialProperty {
    constructor(options) {
        options = Cesium.defaultValue(options, Cesium.defaultValue.EMPTY_OBJECT);
        this._definitionChanged = new Cesium.Event();
        this._color = undefined;
        this._colorSubscription = undefined;
        this.color = options.color;
        this.duration = options.duration;
        this._time = performance.now();
    }
}



Object.defineProperties(PolylineTrailMaterialProperty.prototype, {
    isConstant: {
        get: function() {
            return false;
        }
    },
    definitionChanged: {
        get: function() {
            return this._definitionChanged;
        }
    },
    color: Cesium.createPropertyDescriptor('color')
});

PolylineTrailMaterialProperty.prototype.getType = function(time) {

    return 'PolylineTrail1';
}

PolylineTrailMaterialProperty.prototype.getValue = function(time, result) {
    if (!Cesium.defined(result)) {
        result = {};
    }
    result.color = Cesium.Property.getValueOrClonedDefault(this._color, time, Cesium.Color.WHITE, result.color);
    result.image = Cesium.Material.PolylineTrailImage1;
    result.time = ((performance.now() - this._time) % this.duration) / this.duration;
    return result;
}

PolylineTrailMaterialProperty.prototype.equals = function(other) {
    return this === other ||
        (other instanceof PolylineTrailMaterialProperty &&
            Cesium.Property.equals(this._color, other._color))
}

Cesium.Material.PolylineTrailType = 'PolylineTrail1';

Cesium.Material.PolylineTrailImage1 = "static/image/colors1.png";

Cesium.Material.PolylineTrailSource =
    "czm_material czm_getMaterial(czm_materialInput materialInput)\n\
                                                {\n\
                                                      czm_material material = czm_getDefaultMaterial(materialInput);\n\
                                                      vec2 st = materialInput.st;\n\
                                                      vec4 colorImage = texture2D(image, vec2(fract(st.s - time), st.t));\n\
                                                      material.alpha = colorImage.a * color.a;\n\
                                                      material.diffuse = (colorImage.rgb+color.rgb)/2.0;\n\
                                                      return material;\n\
                                              }";

Cesium.Material._materialCache.addMaterial(Cesium.Material.PolylineTrailType, {

    fabric: {
        type: Cesium.Material.PolylineTrailType,
        uniforms: {
            color: new Cesium.Color(1.0, 0.0, 0.0, 0.5),
            image: Cesium.Material.PolylineTrailImage1,
            time: 20
        },
        source: Cesium.Material.PolylineTrailSource
    },

    translucent: function(material) {
        return true;
    }

});


export default PolylineTrailMaterialProperty;
